<?php
/**
 * Copyright since 2007 PrestaShop SA and Contributors
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@prestashop.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop.com/ for more information.
 *
 * @author    PrestaShop SA and Contributors <contact@prestashop.com>
 * @copyright Since 2007 PrestaShop SA and Contributors
 * @license   https://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 */

/*
 * StockManagerFactory : factory of stock manager
 * @since 1.5.0
 */
class StockManagerFactoryCore
{
    /**
     * @var StockManagerInterface|null Instance of the current StockManager
     */
    protected static $stock_manager;

    /**
     * Returns a StockManager.
     *
     * @return StockManagerInterface
     */
    public static function getManager()
    {
        if (!isset(StockManagerFactory::$stock_manager)) {
            $stock_manager = StockManagerFactory::execHookStockManagerFactory();
            if (!($stock_manager instanceof StockManagerInterface)) {
                $stock_manager = new StockManager();
            }
            StockManagerFactory::$stock_manager = $stock_manager;
        }

        return StockManagerFactory::$stock_manager;
    }

    /**
     *  Looks for a StockManager in the modules list.
     *
     *  @return StockManagerInterface
     */
    public static function execHookStockManagerFactory()
    {
        $modules_infos = Hook::getModulesFromHook(Hook::getIdByName('stockManager'));
        $stock_manager = false;

        foreach ($modules_infos as $module_infos) {
            $module_instance = Module::getInstanceByName($module_infos['name']);

            if (is_callable([$module_instance, 'hookStockManager'])) {
                $stock_manager = $module_instance->hookStockManager();
            }

            if ($stock_manager) {
                break;
            }
        }

        return $stock_manager;
    }
}